Pic #2 shows a Alaska engine. I really like this engine and it pulls a long train. There are two engines working synchronously in this set. This is from the late 1980, early 1990s.

Pic #3 shows an old Junkers freight train. Junkers because it carried Junkers aircrafts in WW2. This set is from the 1990s.

Pic #4 shows some very old Marklin freight cars. Some are heavy metal construction and date back to the 1940s. The three in front are more recent, 1960s. Speaking of heavy metal construction, some of the metal is suceptible to zinc pest. I see it in one of my engines and am on top of it. It will distort and crack the metal. It's due to really poor quality letal that was made available to make toys during WW2. If one keeps the trains in a warm, dry area away from direct sunlight, zinc pest does not show it's uglyness.